Multiple-boring device



{No Model.)

I. H. MILLER. MULTIPLE BORING DEVICE- No. 495,050. Patented Apr. 11, 1893.

. UNITED STATES PATENT OFFICE.

FRANK H. MILLER, OF STANWVOOD, IOYVA.

MULTIPLE-BORING DEVICE.

SPECIFICATION forming part of Letters Patent No. 495,050, dated April 11, 1893.

Application filed February 19, 1892. Serial No. 422,125. (No model.)

To all whom it may concern:

Be itknown that I, FRANK H. MILLER, a citizen of the United States, residing at Stanwood, in the county of Cedar and State of Iowa, have invented certain new and useful Improvements in Multiple Boring Devices; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use the same.

The object of this invention is to provide a tool by the use of which a plurality of holes may be bored at once, as in mortising and the like, and adapted to be attached to an ordinary bit-stock or brace.

The invention consists in the construction, combination and arrangement of parts, as hereinafter fully set forth and claimed.

In the accompanying drawings, forming a part of this specification: Figure 1 is a plan view of a device embodying my invention. Fig. 2 is a vertical section of the same on the line a: ac. Fig. 8 is a fragmentary side elevation illustrating the adjusting device.

Similar letters of reference indicate corresponding parts.

Referring to the drawings, A and A represent the upper and lower parts, respectively, of a case inclosing gear-wheels, E E and F. It will be understood that in theunbroken portion of Fig. 1, the arrangement of gears is precisely the same as that disclosed by the broken away part in the other portion of the figure. The gear-F is in practice made an integral part of the shank F, which terminates at the top in a tapered. and squared part F" fitting the ordinary bit-stock. A portion of the shank forms the upper bearing of the gear, and the same is provided with a hub c on the under side. These parts turn freely in hearings in the case A A. On pins 1) b, which are screw-threaded at the lower end to connect with the lower half of the case B, are pivoted two auxiliary cases B B B B. These pins or studs Z7 Z2 pass through the cases B B and A A, and on them, between the cases A A, are mounted the intermediate gears E. These mesh with the outer gears E E, which are similar to the middle one above described, with the exception of the terminal shank for the bit-stock.

The upper ends of the trunnions of the gears E E and F are provided with suitable thumbscrews 0 c c, and the axis of the gears forms a socket for the shanks of bits H H H.

On the hub of the middle bearing is loosely mounted an arm C, connecting at its ends with the casings B B, by means of links D D and pins 1) c. The former of these is a screw connecting the upper and lower parts of the casings. It will be noted that the casing A A is provided with suitable lugs a a which are provided with screws 0. a to connect the parts of the case.

A portion of the upper case A is extended in a serrated edge a, and by means of a simple eccentric dog Gr pivoted to the arm C the arm may be secured in any desired position.

The operation of the device will now be readily understood. Motion being imparted by the bit-stock to the middle gear and its connected bit, a similar motion is imparted to the auxiliary ones E E through the intermediate gears E E and their connected bits. The result is the simultaneous boring of three holes, and as has been found in practice, with but little more labor, in the case of ordinary sized bits, than is required in boring a single hole. It follows that the boring of a plurality of holes as in mortising is not only greatly facilitated, but as the bits are set exactly in line the work is done with greater accuracy than could be done by a single bit, without the exercise of great care. By swinging the arm 0 around the distance apart of the bits may be adjusted in a moment, as indicated by the dottedlines in Fig. 1.

In practice it is the intention to use machine bits, having shanks of uniform size.

Vhilc the adjustment of the bits, as above noted, is a convenience, particularly in connection with various sized hits, it is not to be understood as absolutely essential to the operativeness of the invention as relates to the leading principle, the boring of a plurality of holes at once by the use of a common bit-stock. It is evident that the outer bits might be set immovably with respect to the middle one, and I desire to claim this feature irrespective of the adjusting device. It is further to be understood that the construction of certain parts, as for example, the dog G, may be varied considerably without departing from the spirit of the invention.

Having now described my invention, I claim- 1. In a multiple boring device, the combination with a shank adapted to connect with a bit-stock, and abit-holding socket and gear connected with or forming a part thereof, of one or more similar bit-holding sockets and gears at a distance from the actuating one,

3; In a multiple boring device the combination with bit holding sockets and gearing,

substantially as described, such sockets being provided with means for holding the bit, of the casing A, the auxiliary casings B B pivoted thereto, the arm 0 and links D D, substantially as and for the purpose set forth.

4. In a multiple boring device, the combination with the casing A, the casings B B, and their connected bit-sockets and gearing as described, of the arm 0, links D D, dog G, and notches a, substantially as and for the purpose set forth.

In testimony whereof I aflix my signature in presence of two witnesses.

FRANK Il. MILLER. lVitnesses:

HOMER E. HART, J AS. G. MoKERRoN. 

